Tankless Water Heater Electric 27kW at 240 Volt, ThermoMate On Demand Instant Hot Water Heater Up to 6.4GMP, Self-Modulating Energy Saving for Residential Indoor Shower, Draw 114Amp
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Availability:
In Stock.
Arrives
Wednesday, May 20
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Size: 240V/27kW
Features
- [Important] - This 27kW Heater Draws max 114Amp currrent which must requiring 3 dedicated Double-pole 40AMP Circuit Breakers using 3 x 8AWG wiring and strongly recommend 200Amp Household Service for stable use
- [Instant Unlimited Hot Water] - On demand tankless electric water heater, providing hot water in 3 seconds when you need it and as long as you need, eliminating wait time, never run out of hot water again and No More cold shower. Flow Rate 5.27GPM @35F Rise.
- [Self-modulating Power] - Self-modulating technology regulating the amount of energy required to heat water only when you need it with 99.8% efficient, saving up to 60% on water heating cost comparing to traditional tank water heater. Wall mounted compact size with no water tank, convenient for any spaces, saving floor space and fitting into tight spaces.
- [Easy Installation & Safety Protection] - ETL certified with overheating protection, auto stop heating when detecting no water, quality workmanship for leakage protection
- NOTE - Make sure this water heater is the correct size for your hot water need: 27kW 208 ~ 240V (adjustable) draw max 114Amp; Required breaker: 3 x Double-POLE 40AMP; Wire gauge 3 x 8AWG; Unit size 17.12" x 13.12" x 3.12"; Water connection 3/4" NPT
Brand: thermomate
Power Source: 208~240V Hardwire
Product Dimensions: 13.12"W x 17.12"H
Special Feature: Instant hot water, Leaking free & Maintenance free heating element
Color: Gray
Power Source: 208~240V Hardwire
Special Features: Instant hot water, Leaking free & Maintenance free heating element
Wattage: 27 KW
Voltage: 240 Volts (AC)
Flow Rate: 5.27 Gallons Per Minute
Maximum Temperature: 140 Degrees Fahrenheit
Heat Output: 27 Kilowatts
Efficiency: High
Maximum Pressure: 150 Pound per Square Inch
Mount Type: Wall
Is Electric: Yes
Item Dimensions W x H: 13.12"W x 17.12"H
Item Depth: 3.12 inches
Brand Name: thermomate
Model Number: ET270
Manufacturer: thermomate
UPC: 750139327607
Manufacture Year: 2024
Manufacturer Part Number: ET270
Included Components: Mount Kit
Item Type Name: tankless water heater
Color: Gray
Style Name: 27kW
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Wednesday, May 20
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Size: 240V/27kW
This tankless water heater offers excellent quality at an exceptional price. Installation was simple, and it has performed flawlessly from day one. What stands out most is the noticeable reduction in my electricity bill since switching to this system. In just two years, it has more than paid for itself. I took a chance moving from a traditional water heater to a tankless model, but it turned out to be one of the best decisions I’ve made.
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Reviewed in the United States on February 5, 2026 by Randy Johnson
Size: 240V/27kW
The installation was straight forward. The instructions were easy to follow and the unit seems to be put together well. The unit has been running well over the last few weeks. No complaints so far.
Reviewed in the United States on April 27, 2026 by Amazon Customer
Size: 240V/27kW
Arrived super fast and packaged nicely. I have installed a few of these units and wanted to get one for myself to truly be able to recommend to my customers. Took about 3 hrs to install with removal of a standard 40 gallon tank. Ran all the electrical needed for power supply and got to work on the piping. I ended up installing a cheap sediment filter on the supply just to try and help keep the heat exchanger clean as much as you can with a cheap filter. I do plan to install a true water softener/filter in the very near future. I would like to try and sell it as a package deal if it works out well. Setup was super simple just like the other units. Very easy to maintenance. It does not come with the flush valves but they are easily ordered separate or you can get them at the big box stores. High quality materials and super super simple settings. Nice digital display tells you the current water temp and a small red light shows its heating. I did install an energy monitor on all 3 circuts to see what my true usage is and its actually very little. In 3 weeks about 55kwhs total. We use 120°F for our setpoint. I would definatly recommend this to anyone looking for a quality water heater.
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Reviewed in the United States on March 16, 2023 by Ashley & Tony
Size: 240V/27kW
Went in fairly easy. Just a little drip that went away after a couple days. Does a great job of heating the water. The hot water takes as long as the tank heater to get to your spigot but the difference is that you don't run out like with the tank heater. We can now fill the big tub and take long back to back showers. It cost me a fortune because I did not have enough space in my service for 6 #8 wires 3 double 40a breakers. But my panel was due for upgrade anyway. I put mine right into the old tank closet. I was concerned that the documents called for 12" clearance at the sides. I only had about 8" but I have noticed no great heat to the sides. I hope it lasts a long time but I am pleased now.
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Reviewed in the United States on July 28, 2023 by C. E. M.
Size: 240V/27kW
Works great. These stand behind what they sell.
Reviewed in the United States on January 7, 2026 by rick
Size: 240V/27kW
This unit didn’t provide 5 consistent gallons a min when it was 105 degrees outside let alone 5 gallons per min at 35 degrees. It did however work well enough. Until last week. Power went out and when it came back on unit wouldn’t heat past 73 degrees Fahrenheit. 24/7 tech support????? I can’t even get them on the phone, I’ve been with out hot water almost 1 week and have called multiple times. I bet they well call aug 8th of next year when there limited warranty expires. If you can’t afford a better hot water heater. This is for you. I don’t regret my purchase. The price was low enough to cover 13 months of service. I’m sure it’s a simple fix, just sucks I’ll have to void my warranty because I can’t get ahold of someone
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Reviewed in the United States on October 11, 2023 by Richard l brown
Size: 240V/27kW
Not yet installed, but descriptions seem to make it unique in the field. Cannot determine flushing necessity, due to conflicting claims, but reviews indicate less need. Went with the valve kit to make flushing easier, whenever. Inlet screen cleaning indicated as "regular". I suppose that depends on the sediment from the water supply. Having a water softener should help. Still waiting for upgrade of electrical service from 200 to 400 amps, as this adds over 100 amps to the draw. But only when in use should greatly lower wattage, as a tank heats 24/7.
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Reviewed in the United States on March 21, 2026 by artful
Size: 240V/27kW
So far so good installation was easy. I have it set at 120 degrees and I am happy with the continuous amount of hot water it provides during washing clothes and taking a shower. I swapped out multiple of my big old breakers and use double poles to make space in the panel.
Reviewed in the United States on July 23, 2024 by Oneil